no-mixed-spaces-and-tabs

Disallow mixed spaces and tabs for indentation

This rule was deprecated in ESLint v8.53.0. Please use the corresponding rule in @stylistic/eslint-plugin-js.

Most code conventions require either tabs or spaces be used for indentation. As such, it’s usually an error if a single line of code is indented with both tabs and spaces.

Rule Details

This rule disallows mixed spaces and tabs for indentation.

Examples of incorrect code for this rule:

/*eslint no-mixed-spaces-and-tabs: "error"*/

function add(x, y) {
	  return x + y;
}

function main() {
	var x = 5,
	    y = 7;
}
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Examples of correct code for this rule:

/*eslint no-mixed-spaces-and-tabs: "error"*/

function add(x, y) {
	return x + y;
}
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Options

This rule has a string option.

• "smart-tabs" allows mixed tabs and spaces when the spaces are used for alignment.

smart-tabs

Examples of correct code for this rule with the "smart-tabs" option:

/*eslint no-mixed-spaces-and-tabs: ["error", "smart-tabs"]*/

function main() {
	var x = 5,
	    y = 7;
}
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Version

This rule was introduced in ESLint v0.7.1.

Further Reading

EmacsWiki: Smart Tabs
www.emacswiki.org

Resources

• Rule source
• Tests source